Windows 10 - Spinning icon with blue background (lock screen issue)

Possible solutions/causes:

• Don't have any devices (USB, HDMI, etc.) connected during boot
• Press Enter / click left on mouse multiple times in succession until the lock screen comes back
• Run sfc /scannow
• Run DISM /Online /Cleanup-Image /RestoreHealth
• To shrink the disk, run Dism.exe /online /Cleanup-Image /StartComponentCleanup /ResetBase
• Dism.exe /online /Cleanup-Image /SPSuperseded
• Disable startup items - Autoruns
• Disable Windows telemetry e.g. OO ShutUp10 or reclaimWindows10.ps1
• Windows Event Logs
• Antivirus logs